/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --card-bg: #111633;
      --electric-blue: #00C2FF;
      --accent-orange: #FF6B35;
      --white: #FFFFFF;
      --text-light: #B0C4DE;
      --text-muted: #6B7D99;
      --glass-bg: rgba(17, 22, 51, 0.7);
      --glass-border: rgba(0, 194, 255, 0.15);
      --glow-blue: 0 0 20px rgba(0, 194, 255, 0.4);
      --glow-orange: 0 0 20px rgba(255, 107, 53, 0.5);
      --border-radius-card: 16px;
      --border-radius-sm: 12px;
      --border-radius-btn: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-mono: 'Roboto', sans-serif;
      --transition-smooth: all 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--deep-space);
      color: var(--text-light);
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--white);
    }
    h1 {
      font-size: 48px;
    }
    h2 {
      font-size: 36px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    .section-title {
      position: relative;
      display: inline-block;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 12px;
      font-weight: 500;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--electric-blue);
      display: block;
      margin-bottom: 8px;
    }
    .container-custom {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .navbar {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(to right, var(--electric-blue), transparent);
      background-size: 100% 1px;
      background-position: bottom;
      background-repeat: no-repeat;
      height: 72px;
      padding: 0;
      transition: var(--transition-smooth);
    }
    .navbar-brand {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--electric-blue), #80E0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .navbar-nav .nav-link {
      color: var(--text-light) !important;
      font-weight: 500;
      margin: 0 16px;
      transition: var(--transition-smooth);
      padding: 8px 0;
      position: relative;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--electric-blue) !important;
    }
    .btn-cta-nav {
      background: var(--accent-orange);
      color: var(--white) !important;
      border-radius: var(--border-radius-btn);
      padding: 12px 28px;
      font-weight: 700;
      box-shadow: 0 0 18px rgba(255, 107, 53, 0.4);
      transition: var(--transition-smooth);
      border: none;
      margin-left: 24px;
    }
    .btn-cta-nav:hover {
      background: #ff7f50;
      box-shadow: var(--glow-orange);
      transform: scale(1.05);
    }
    .navbar-toggler {
      border-color: rgba(0,194,255,0.3);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,194,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(25px);
        padding: 24px;
        border-radius: 16px;
        margin-top: 12px;
      }
      .btn-cta-nav {
        margin-left: 0;
        margin-top: 16px;
        display: block;
        text-align: center;
      }
    }
    /* Hero */
    #hero {
      height: 100vh;
      background: radial-gradient(circle at 30% 50%, #1a1f4b 0%, #0A0E27 70%);
      position: relative;
      display: flex;
      align-items: center;
      overflow: hidden;
    }
    .hero-particle {
      position: absolute;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><circle cx="50" cy="80" r="2" fill="%2300C2FF" opacity="0.4"/><circle cx="300" cy="120" r="3" fill="%23FF6B35" opacity="0.3"/><circle cx="150" cy="300" r="1.5" fill="%23ffffff" opacity="0.2"/></svg>');
      background-size: cover;
      opacity: 0.5;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.3;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero-title span {
      border-bottom: 3px solid var(--electric-blue);
      display: inline-block;
      padding-bottom: 4px;
    }
    .btn-primary-glow {
      background: var(--accent-orange);
      border: none;
      border-radius: var(--border-radius-btn);
      padding: 14px 36px;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(255,107,53,0.5);
      transition: var(--transition-smooth);
      color: white;
    }
    .btn-primary-glow:hover {
      background: #ff8c5a;
      box-shadow: var(--glow-orange);
      transform: scale(1.05);
    }
    .btn-outline-blue {
      border: 2px solid var(--electric-blue);
      background: transparent;
      color: var(--electric-blue);
      border-radius: var(--border-radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    .btn-outline-blue:hover {
      background: rgba(0,194,255,0.15);
      box-shadow: 0 0 15px rgba(0,194,255,0.4);
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      box-shadow: 0 8px 32px rgba(0,0,0,0.3);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 40px rgba(0,194,255,0.25);
      border-color: rgba(0,194,255,0.35);
    }
    .feature-img-wrapper {
      background: rgba(0,194,255,0.08);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(0,194,255,0.2);
    }
    .data-highlight {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-orange);
    }
    .pricing-card {
      background: rgba(17,22,51,0.8);
      backdrop-filter: blur(18px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--border-radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
    }
    .pricing-highlight {
      border: 2px solid var(--electric-blue);
      box-shadow: 0 0 28px rgba(0,194,255,0.35);
      position: relative;
    }
    .badge-popular {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent-orange);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 13px;
      font-weight: 600;
    }
    .accordion-button {
      background: rgba(17,22,51,0.7);
      color: white;
      font-weight: 600;
      border: 1px solid rgba(0,194,255,0.15);
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,194,255,0.1);
      color: var(--electric-blue);
      box-shadow: 0 0 15px rgba(0,194,255,0.4);
    }
    .footer-cta {
      background: #080B1A;
      padding: 80px 0;
    }
    footer {
      background: #050714;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .hero-title { font-size: 32px; }
    }